261results about "Synchronisation" patented technology

The invention provides a joint denoising method and system based on multi-source noise suppression and sparse representation, and belongs to the technical field of noise suppression in ultrasonic detection of power equipment, and the method comprises the steps: synchronously collecting an ultrasonic echo signal, a vibration signal and an electromagnetic signal of a composite insulator; decomposing the ultrasonic echo signal into a plurality of modal components and undecomposed signal margins; extracting a dominant frequency component in the vibration signal, and identifying a resonance noise feature overlapped with the frequency band of the ultrasonic signal; detecting a pulse interference event in the electromagnetic signal, marking occurrence time and a frequency range, and generating a pulse event feature; performing frequency band suppression and time domain threshold processing on the modal component according to the resonance noise characteristics and the pulse event characteristics; performing sparse representation coding on the processed modal components, executing multiple rounds of iterative screening and orthogonalization processing, and screening an atom set matched with defect echoes; and reconstructing the de-noised ultrasonic signal by using the screened atom set, and combining the de-noised ultrasonic signal with the undecomposed signal margin to output a final result.

The invention discloses a defect detection method for transformer substation unmanned aerial vehicle inspection equipment, and belongs to the technical field of transformer substation defect detection. Performing temperature field inversion correction on the monitoring data, establishing an incidence matrix according to sub-pixel displacement quantification mechanical deformation, and matching a preset defect feature library to obtain a first detection result; according to the first detection result and an assembly digital twin model, correcting the incidence matrix and positioning an abnormal area; inputting the corrected incidence matrix into a defect detection model embedded with the component prior constraint, and outputting a second detection result; and constructing a causal graph of the inspection records and the assembly working conditions, and outputting a predictive maintenance strategy according to the second detection result and the abnormal region. According to the invention, the problems of low detection precision and insufficient association degree with the component state in the aspect of component defect detection in the prior art are solved.

The invention relates to the technical field of data acquisition, and discloses a distributed photovoltaic data acquisition method and device based on time synchronization. The method comprises the following steps: performing distributed transmission processing on nanosecond synchronous acquisition reference signals through a time delay compensation network to obtain trigger synchronization signals of a plurality of acquisition nodes, and performing data acquisition processing through a multi-channel parallel sampling circuit to obtain original voltage and current data; and carrying out data verification processing on the original voltage and current data through a digital filtering algorithm to obtain effective acquisition data, carrying out string matching analysis processing to obtain string feature distribution, and carrying out data screening processing through a state evaluation algorithm to obtain real-time performance data of the photovoltaic module. Through high-precision clock synchronization and parallel sampling technologies, nanosecond sampling synchronization of a plurality of acquisition nodes is realized, and the acquisition data is ensured to have a strict time sequence corresponding relation, so that an accurate data basis is provided for performance evaluation and fault diagnosis of the photovoltaic module.

The invention provides a dynamic high-precision PTP (Precision Time Protocol) time synchronization system realized based on an FPGA (Field Programmable Gate Array), which comprises a master device and a slave device, and the master device and the slave device are connected through a PHY (Physical Layer) to carry out PTP time synchronization; the master device and the slave device have the same structure and comprise an FPGA and a voltage-controlled crystal oscillator; in the master device, the FPGA obtains the frequency difference and the phase difference between the master device and an externally input reference source, further adjusts the frequency of a voltage-controlled crystal oscillator, corrects a local time mark, and sends a PTP message to the slave device; and in the slave equipment, the FPGA obtains the frequency difference and the phase difference between the slave equipment and the master equipment based on the received PTP message, so that the frequency of the voltage-controlled crystal oscillator is adjusted, and the local time scale is corrected. According to the invention, low-cost and high-precision PTP time synchronization is realized.

The invention relates to the technical field of satellite time service, and provides a satellite time service system and method for preventing cheating and suppressing interference, and the system is characterized in that double GNSS radio frequency modules are integrated in a GNSS radio frequency board, and each GNSS radio frequency module is responsible for receiving a BDS satellite signal; a double-BDS signal deception jamming recognition module is integrated in the satellite receiving board, and each BDS signal deception jamming recognition module is provided with a GNSS signal suppressing jamming detection method and a GNSS signal deception jamming detection method so as to perform jamming detection on one path of BDS satellite signals to obtain a satellite signal jamming state; the CPU is used for reading serial port message data for the two satellite signal deception jamming identification modules and analyzing UTC time; meanwhile, according to the satellite signal interference state, a radio frequency switch instruction is determined; and the FPGA is used for controlling the two GNSS radio frequency modules to output or reject BDS satellite signals according to the radio frequency switch instruction.

The invention discloses a cosmic ray muon-based time synchronization system and synchronization method, and relates to the field of digital information transmission. The system comprises a time detector and a track detector which are arranged corresponding to a standard clock, and a case matching module, a time difference calculation module, a time adjusting module, a time detector and a track detector which are arranged corresponding to a clock to be calibrated, the case matching module is used for matching the cosmic ray muons according to the track information of the cosmic ray muons detected by the two track detectors and determining whether the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case or not, and if the cosmic ray muons penetrating through the two time synchronization devices belong to the same muon case, the time difference calculation module is used for obtaining theoretical flight time according to the track information detected by the track detectors; actual flight time is obtained according to a time detector; the time deviation is calculated according to the actual flight time and the theoretical flight time, the time adjusting module calibrates the clock to be calibrated according to the time deviation, and the precision and reliability of time synchronization in complex environments such as underwater and underground environments are improved.

The invention relates to the technical field of power systems, in particular to an intelligent substation relay protection secondary circuit verification device. A time synchronization signal in the intelligent substation is received through the time synchronization time synchronization module, after a local clock is calibrated, synchronous connection between the verification device and external time is disconnected, the time of the device is maintained to be stable through the time synchronization high-precision time keeping module, and when a time synchronization signal interface is lacked, the time synchronization signal is provided through the time synchronization time service module; the switching value acquisition and recording module records signal changes of an intelligent terminal device and a primary device mechanism action contact, the detection devices establish data connection with the relay protection tester through the tester communication interaction module and perform communication interaction, and a communication network of the multiple detection devices and the relay protection tester is constructed. By simplifying the verification process and improving the test reliability, a more efficient solution is provided for the power industry, and safe operation and management of the intelligent substation are promoted.

The invention provides an inter-station time synchronization constrained VLBI world time measurement method, which comprises the following steps: determining at least two observation stations for observing a radio power source, and carrying out precise clock synchronization to obtain a precise inter-station clock difference; using the at least two observation stations to simultaneously observe the same radio power source to obtain observation time delays from the same radio power source to the at least two observation stations; separating the clock error in the observation time delay by using the precise inter-station clock error to obtain the observation time delay of the separated clock error; and removing ionosphere time delay, troposphere time delay and equipment time delay in the observation time delay of the separated clock error to obtain final observation time delay, and resolving a residual error between the final observation time delay and theoretical time delay to obtain world time. According to the invention, precise time synchronization between observation stations is carried out in advance, and inter-station errors are effectively separated. The problem that VLBI observation time delay and inter-station clock correction are difficult to separate is solved, the UT1 resolving precision can be effectively improved, and the requirement for high-precision UT1 in the fields of deep space exploration and the like is expected to be met.

The invention provides a time synchronization method and device and a time synchronization system of an intelligent driving system, and relates to the technical field of data processing, in particular to the technical fields of automatic driving, electronic technology and time synchronization. The specific implementation scheme of the time synchronization method comprises the following steps: acquiring second-level world time and a corresponding second pulse signal; determining a second global timestamp corresponding to a predetermined edge of the pulse per second signal according to a first local timestamp of the captured pulse per second signal, a second local timestamp of the execution moment of the interrupt service function and the first global timestamp; wherein the interrupt service function is triggered by a second pulse signal; obtaining the second time of the current moment according to the global timestamp of the current moment and the second global timestamp; and obtaining the accurate time of the current moment according to the second-level world time and the within-second time. According to the invention, errors can be reduced, and high-precision global time can be provided.

The embodiment of the invention provides a Beidou high-precision time synchronization time service protection isolation method and system, and belongs to the technical field of power system time synchronization. According to the invention, the Beidou time service module is integrated; configuring a time synchronization service according to the Beidou time service module; creating a communication domain; according to the communication domain, setting integrity check; and performing time synchronization monitoring according to the integrity check and the time synchronization service to complete time service protection isolation. The method can be suitable for complex distributed system environments with high requirements on time synchronization, such as a smart grid, improves the operation efficiency and reliability of a power system, and provides important technical support for the development of the smart grid.

The invention relates to a local clock calibration method and a time synchronization signal channel expansion system, a timed device receives a PPS signal transmitted by a channel expansion device, and the method comprises the following steps: based on a received PPS output signal, measuring and determining a period deviation y of a local clock of the timed device relative to a standard time; dynamically generating a correction step z and a correction interval b based on the period deviation y according to an allowable error threshold value Q; and in the next time service period, taking the calibration time interval b as a period, and utilizing the calibration step z to carry out multiple times of incremental adjustment on a local calibratable time counter, so that the timing of the local calibratable time counter is close to the standard time. According to the invention, the problem of one-to-many signal distribution can be solved with low cost and high reliability, and a time service algorithm which is low in calculation overhead and easy to transplant and deploy on MCUs with various performance levels can be realized.

The invention discloses a portable PPP-B2b Beidou positioning and timing device. The portable PPP-B2b Beidou positioning and timing device comprises a GNSS (Global Navigation Satellite System) receiver module, a resolving module and a data resolving precision evaluation module, the GNSS receiver module is used for obtaining an original navigation message and an observed quantity, the resolving module comprises a microcontroller, a serial port communication unit and a clock unit, the original navigation message and the observed quantity are output to the microcontroller in a real-time data flow mode, and the microcontroller receives data and then arranges the data to generate real-time precise track data; position and time calculation is carried out through the data calculation precision evaluation module, position information is sent out through the serial port communication unit, a clock error sequence is forecasted, and the frequency of the clock unit and output of second signals are controlled. The positioning time service device with the precision of static centimeter level, dynamic decimeter level and superior to nanosecond level is realized, the requirements of precise positioning and time synchronization of electric power services such as intelligent inspection and personnel safety operation on a scene without ground communication are met, and an automatic real-time solution is provided.

The invention discloses a dynamic master clock selection method based on Kalman filtering and Bayesian estimation, which is applied to the technical field of master clock selection, and comprises the following steps: constructing a virtual clock by calculating observation equations of a plurality of atomic clocks; performing state estimation on the atomic clocks by using a Kalman filtering method to obtain state estimation values of the atomic clocks; the state estimation value of each atomic clock comprises the phase and frequency estimation value of the atomic clock; the phase of each atomic clock is the phase deviation of the atomic clock relative to the virtual clock, and the frequency estimation value is the frequency estimation value of the atomic clock relative to the virtual clock; calculating the short-term frequency stability and the long-term frequency drift rate of the atomic clock based on the state estimation value of each atomic clock, and defining the comprehensive performance index of the atomic clock based on the short-term frequency stability and the long-term frequency drift rate; and calculating the posterior probability of each atomic clock based on the comprehensive performance index of each atomic clock and the current observation data by using a Bayesian estimation method so as to perform high-flexibility and high-reliability main clock selection.

Provided are a time synchronization method, apparatus and time synchronization system of an intelligent driving system, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining (S210) a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining (S220) a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining (S230) a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining (S240) an accurate time of the current time instant.

The invention is suitable for the technical field of intelligent electric energy meters, and relates to an electric energy meter clock calibration system and method, and the system comprises an external clock module which is used for transmitting a second pulse signal to a microcontroller; the built-in clock module is used for providing real-time clock and calendar functions and automatic leap year adjustment, supporting an alarm clock and a periodic terminal, and realizing a built-in hard clock through an external crystal; the internal soft clock module is used for periodically triggering a timer terminal and synchronizing pulse per second of an external clock after accumulating a certain number of times; and the internal and external clock automatic switching module is used for switching to the internal clock module when the external clock module breaks down and synchronizing the internal soft clock module so as to ensure the accuracy of the clock. The electric energy meter clock is simple in structure and convenient to operate, and the accuracy and reliability of operation of the electric energy meter clock are effectively improved.

The invention relates to the resetting of a receiver timer of a receiver for correlating receiver time information with a time generated by a transmitter timer of a transmitter, wherein the receiver is designed to receive radio messages transmitted to it by the transmitter. During this resetting, a first message from the transmitter is received by the receiver, wherein the reception comprises a radio time period during which the receiver's radio is active. Information is determined from which the start time or end time of the radio time period can be determined. The receiver timer is then reset according to the determined information. The method is flexible and can be used in particular for so-called "sleepy devices" or receivers that are temporarily in a sleep state.

The embodiment of the invention provides a mobile mapping system and a time synchronization method, and is applied to the technical field of positioning and map construction. The system comprises a device to be synchronized, an industrial personal computer and a controller. The controller is used for determining a global time reference and determining a reference time point for acquiring a hardware trigger signal; the to-be-synchronized device is used for acquiring data according to the hardware trigger signal; and the industrial personal computer is used for associating the data acquisition time of the to-be-synchronized equipment with the global time reference according to the global time reference and a receiving time point for receiving the data sent by the to-be-synchronized equipment. The time service mode depends on a hardware trigger signal, and effective time service of data acquired by the multi-source sensor can still be realized in a scene with weak GNSS signals or without GNSS signals, so that the synchronization precision of data acquisition time of the multi-source sensor is improved.

A wireless parking meter with an improved antenna location is described. The antenna may be located within a covering protruding from the top of the parking meter, allowing radio frequency (RF) signals to be transmitted through a portion of the parking meter with high permittivity to the RF signals. Additionally or alternatively, the antenna may be located within the parking meter housing above a lower parking meter mechanism housing so that RF signals can be transmitted through the dome covering of the parking meter, which may have a high permittivity to the RF signals.

The present invention relates to the field of pulsar time technology, and in particular to a method and system for determining a comprehensive pulsar time based on timing residuals, including: preprocessing and filtering the initial timing residuals of each selected optimal pulsar to obtain a corresponding smoothed timing residual; selecting a reference pulsar, and according to the number of observation points of the reference pulsar, equally spaced downsampling the smoothed timing residuals and initial errors of each optimal pulsar to obtain the corresponding downsampled timing residuals and downsampled initial errors, thereby obtaining the stability of the comprehensive pulsar time. The present invention obtains the stability of the comprehensive pulsar time through preprocessing, Vondrak filtering, downsampling and weighted average algorithm, which not only ensures that all points of the pulsar timing residuals are aligned, has strong interpretability, but also makes the stability of the comprehensive pulsar time more than one order of magnitude higher than the average level of the stability of a single pulsar, and has high credibility.

The invention discloses an indoor and outdoor seamless data synchronization device and method, the device comprises a GNSS module, an inertial measurement module and a programmable control module, the GNSS module is used for receiving a 1PPS signal and GPRMC information generated by an external atomic clock; the inertial measurement module is used for performing fusion processing on the position information generated by the GNSS module to generate position, attitude and speed information; the programmable control module is connected with the GNSS module and the inertial measurement module through a serial port, and is used for receiving a 1PPS signal and GPRMC information of the GNSS module, aligning a square wave generated by a local clock with a square wave of the 1PPS signal of the GNSS module, performing frequency division on the square wave according to a preset frequency, continuously and stably outputting a pulse wave signal and time information of a corresponding frequency through the serial port, and transmitting the pulse wave signal and the time information to the inertial measurement module. Clock signals are calibrated through external calibration factors, an algorithm model is arranged in the programmable control module, and when indoor and outdoor data are synchronized, the algorithm model is called to carry out deviation calculation and smooth processing on signals needing to be aligned, so that the indoor and outdoor data are synchronized.

The invention discloses a local time pulse signal holding method and system under reference lock loss. The method comprises the following steps: establishing a holding algorithm model of a relationship between frequency control words and drift distances of two digital-to-analog converters; when it is monitored that the second pulse signal of the reference source is in a lock losing state, frequency control words Fw1 and Fw0 of the current round of the two digital-to-analog converters are collected; and inputting the frequency control words Fw1 and Fw0 into the maintenance algorithm model to obtain a new round of frequency control words Fw1 (i) and Fw0 (i) of the two digital-to-analog converters. By compensating the output frequency of the local clock source, the frequency drift of the local clock source caused by factors such as temperature and aging is improved, so that the timing system can still maintain higher frequency output precision within a certain time.

Provided are a time synchronization method, a time synchronization system of an intelligent driving system, an electronic device and a storage medium, relating to the technical fields of autonomous driving, electronic technology, and time synchronization. The method includes: obtaining a second-level universal time and a corresponding Pulse Per Second signal; based on a first local timestamp of a captured Pulse Per Second signal, a second local timestamp of an execution time instant of an interrupt service routine, and a first global timestamp, determining a second global timestamp corresponding to a predetermined edge of the Pulse Per Second signal; based on a global timestamp of a current time instant and the second global timestamp, obtaining a sub-second time of the current time instant; based on the second-level universal time and the sub-second time, obtaining an accurate time of the current time instant.

A method, device, computer equipment and storage medium for GNSS time synchronization are disclosed. The method includes: receiving data packet of NMEA protocol, reading a valid UTC time from data packet of NMEA protocol, and storing the read valid UTC time in a time synchronization controller; receiving PPS signal, capturing a local time output by local clock when PPS signal is generated, and storing the local time in the time synchronization controller; reading a last local time stored before the current local time and reading the stored latest UTC time as a UTC time corresponding to the last local time when the time synchronization controller receives the current local time; and determining, by the time synchronization controller, a local time correction amount according to the last local time and the UTC time corresponding to the last local time, and correcting the local clock according to the local time correction amount.

The invention discloses a high-precision self-timekeeping method based on an FPGA, and relates to the technical field of high-precision time synchronization, and the method comprises the steps: providing a 10MHz system clock through a constant-temperature active crystal oscillator, carrying out the up-sampling of the clock frequency to 200MHz through a phase-locked loop frequency multiplication algorithm, and carrying out the up-sampling of the clock frequency to 200MHz; performing time synchronization on the system by using reliable time data and effective pulse per second signals provided by a satellite module, screening and selecting reference pulse per second, recording reference pulse per second data of at least 30 minutes, monitoring a rising edge of the pulse per second based on a sampling rate of 200MHz, and storing a maximum value of a counter per second to an RAM (Random Access Memory); the high-precision self-timekeeping method based on the FPGA not only can cope with complex environmental conditions, but also can ensure that stable synchronization performance is kept under long-time operation, so that the strict requirement of a modern high-precision time synchronization system on clock precision is met.

The invention discloses a high-precision time keeping method and system based on a Beidou module and an RTC chip, and relates to the technical field of high-precision time synchronization, and the method comprises the steps: setting and initializing a time keeping system; receiving a Beidou time service signal, and recording a time message; writing and reading RTC time based on the time message, and calculating read-write delay; calculating an RTC punctuality error based on the read-write delay; based on the RTC punctuality error, first operation is carried out when Beidou time service is normal, and second operation is carried out when Beidou time service is abnormal; according to the invention, under the condition that signal loss of the Beidou module occurs on site, the time precision is obtained from the RTC by compensating the punctuality error of the RTC chip, so that the demand of on-site high-precision time synchronization is met; and compared with other high-precision time-keeping complex schemes, the cost is more advantageous.

Provided is a novel system for identifying the location of a terminal carried by a user or operated by the user.　This system includes at least one computer device. The system includes a location identification means for identifying the location of a terminal carried or operated by a user on the basis of the distance between each of a plurality of wireless devices and the terminal. The terminal may be a portable terminal carried by a first user. The system may include an evacuation-site identification means that identifies, on the basis of the identified location of the portable terminal, an evacuation site satisfying a prescribed condition.

Provided is a wireless time servicing method, device and system. The wireless time servicing method includes: obtaining absolute time information sent by an external clock source; correcting a system time of a master station according to the absolute time information; broadcasting path information to a slave station; receiving feedback from the slave station in response to the path information, calculating a transmission path delay between the master station and the slave station, and storing the transmission path delay in the time information; and sending the time information to the slave station.

The invention relates to a multi-time-source PTP time service circuit based on a Loongson SOC, and belongs to the technical field of timing systems. The time service circuit comprises a Loongson SOC, an FPGA, a high-stability crystal oscillator, an RS422 transceiver, a network card, a switch, computing blades 1-6 and an external clock source. According to the design scheme, the performance is stable and reliable, the mode is novel, the problem that interfaces between devices are incompatible in the equipment development process is solved, meanwhile, a design thought is provided for the time service scheme of the reinforced server, and a new solution is provided for transition of a new time service scheme and an old time service scheme. The scheme has been successfully applied to a certain reinforced server.

The invention discloses a time-frequency signal security bastion host which comprises an input module, an output module, a signal modulation and demodulation module, an identity authentication module, an equipment management module, a power management module, a signal security detection module, an equipment security audit module and a security login management module. Intranet and extranet isolation is carried out on extranet standard time-frequency signals and intranet time-using equipment through the time-frequency security bastion host, high-precision time-frequency security time service and output of intranet time synchronization signals are achieved, the accuracy of high-precision time frequency and the non-tampering property of standard time are guaranteed, and credible transmission of high-precision standard time is achieved.

The invention discloses an intelligent diagnosis method and system for a distribution network hot-line work robot. The intelligent diagnosis method comprises the following steps that clock synchronization is conducted on all parts of the distribution network hot-line work robot; collecting multi-source data of the distribution network hot-line work robot under the synchronous clock, wherein the multi-source data comprises operation data of each part of the distribution network hot-line work robot; performing data fusion on the multi-source data based on a dynamic adaptive weighted fusion algorithm of the multi-source heterogeneous data to obtain fused data; and constructing a three-level diagnosis model to carry out fault diagnosis on the fused data to obtain the fault type of the distribution network hot-line work robot component. According to the method, the multi-source data of the distribution network hot-line work robot are fused, and the multiple diagnosis models are constructed for fault diagnosis, so that accurate diagnosis and early warning of component faults of the distribution network hot-line work robot are realized, the missed diagnosis rate is reduced, and the maintenance cost is reduced.